diff --git a/oden-js-sys/quickjs/Makefile b/oden-js-sys/quickjs/Makefile
index 097a7e9e..77f27a99 100644
--- a/oden-js-sys/quickjs/Makefile
+++ b/oden-js-sys/quickjs/Makefile
@@ -46,7 +46,7 @@ prefix=/usr/local
 # use the gprof profiler
 #CONFIG_PROFILE=y
 # use address sanitizer
-#CONFIG_ASAN=y
+CONFIG_ASAN=y
 # include the code for BigInt/BigFloat/BigDecimal and math mode
 CONFIG_BIGNUM=y
 
diff --git a/oden-js-sys/quickjs/quickjs-opcode.h b/oden-js-sys/quickjs/quickjs-opcode.h
index 877ea45d..a99c5666 100644
--- a/oden-js-sys/quickjs/quickjs-opcode.h
+++ b/oden-js-sys/quickjs/quickjs-opcode.h
@@ -260,10 +260,11 @@ DEF(is_undefined_or_null, 1, 1, 1, none)
 DEF(      mul_pow10, 1, 2, 1, none)
 DEF(       math_mod, 1, 2, 1, none)
 #endif
-DEF(     breakpoint, 1, 0, 1, none)
 /* must be the last non short and non temporary opcode */
 DEF(            nop, 1, 0, 0, none) 
 
+DEF(     breakpoint, 1, 0, 1, none)
+
 /* temporary opcodes: never emitted in the final bytecode */
 
 def(    enter_scope, 3, 0, 0, u16)  /* emitted in phase 1, removed in phase 2 */
diff --git a/oden-js-sys/quickjs/quickjs.c b/oden-js-sys/quickjs/quickjs.c
index f7033f31..159ecb81 100644
--- a/oden-js-sys/quickjs/quickjs.c
+++ b/oden-js-sys/quickjs/quickjs.c
@@ -109,6 +109,8 @@
 /* test the GC by forcing it before each object allocation */
 //#define FORCE_GC_AT_MALLOC
 
+#define CONFIG_DEBUGGER
+
 #ifdef CONFIG_ATOMICS
 #include <pthread.h>
 #include <stdatomic.h>
@@ -310,11 +312,13 @@ struct JSRuntime {
 #endif
     void *user_opaque;
 
+#ifdef CONFIG_DEBUGGER
     struct list_head breakpoint_list;
     JSDebugCallbackFunc *debug_callback;
     void *debug_opaque;
     int stepping_pc;
     uint8_t stepping_byte;
+#endif
 };
 
 struct JSClass {
@@ -1660,7 +1664,9 @@ JSRuntime *JS_NewRuntime2(const JSMallocFunctions *mf, void *opaque)
 #endif
     init_list_head(&rt->job_list);
 
+#ifdef CONFIG_DEBUGGER
     init_list_head(&rt->breakpoint_list);
+#endif
     
     if (JS_InitAtoms(rt))
         goto fail;
@@ -54315,6 +54321,7 @@ JSBreakpoint *JS_SetBreakpoint(JSContext *ctx, JSAtom file, int line)
             }
         }
     }
+
     return NULL;
 }